As a suggestion, if there is a set of steps to follow to ensure that the functionality does appear, or a simple checklist of items that need to be configured before or after installation, it would help to place that on the plugin's web page.

No comments in a month? Please tell me someone at least looked at this.
Meanwhile, I have confirmed on Firefox v33.1 that this occurs there, too. I still see no way to invoke any aspect of this plugin – not in a job config, not in system config, not anywhere else under Manage Jenkins, not in workspaces, dashboard, views. Am I missing something obvious? What should I expect to see, and where?

I do have Token Macro 1.10 and Run Condition 1.0 plugins installed. Now Jenkins 1.590.

Now at 1.598, the functionality suddenly appears in every job. I was configuring a new job from scratch, and there it was, right above the "Build" section. Seems to work fine. I installed it again on the old system, and it started working right away there, too.

Speculating, maybe something in the system config.xml blocked it from appearing, but creating the new job tickled the XML in some way to make it finally appear? Or some other fix between 1.585 and 1.598 cleared the blocking bug?

I think I'm more upset that nobody commented on this or on the thread or two I posted on the Google group, and I still think the feature could use better documentation.

Also took me a while to figure it out :

The plugin can be seen in the Build Environment section ... (see screenshots)